Improvement in machines for grinding harvester-knives



UNITED STATES PATENT OFFICE.

JAMES M. CONNEL, OF NEWARK, OHIO.

IMPROVEMENT IN MACHINES FOR GRINDING HARVESTER-KNIVES.

Specification forming part of Letters Patent No. 140,810, dated July 15, 1873; application filed January 9, 1873.

CASE B.

To all whom it may concern:

Be it known that I, JAMES M. OoNNnL, of Newark, in the county of Licking and in the State of Ohio, have invented certain new and useful Improvements in Machine for Grinding Harvester- Knives; and do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, and to the letters of reference marked thereon, making apart of this specification.

My present invention is intended as an improvement upon the machine for grinding harvester-knives, for which Letters Patent were granted to me July 16, 1872; and the nature of my invention consists, first, in a rest formed upon the standard to support the arm which carries the emerywheel when said arm is thrown backward second, in the arrangement of cog-gearing for running the emery-wheel; third, in an adjustable metallic rest for the knives; and, fourth, in anadjustable guide for the knife-bar, all of which will be hereinafter more fully set forth.

In order to enable others skilled in the art to which my invention appertains to make and use the same, I will now proceed to describe its construction and operation, referring to the annexed drawing, in which Figure 1 is a perspective view of my improved machine. Fig. 2 is a side elevation of a part of the standard, showing the arm supported by the rest on the standard, and Fig. 3 is an enlarged perspective View of one of the adjustable knife-rests.

A represents the platform with the curved slotted standard B. O is "the driving-wheel with suitable handle for turning the same, and D is the arm carrying at its outer end the conical emery-wheel E, all of said parts being constructed and arranged substantially in the same manner as described in my former patent, with the exception that in my former case the front end of the slot in the standard was dropped down for certain specific purposes; but in this present case such is not necessary, and hence the slot in the standard is made straight and parallel with the surface of the platform.

In my former patent the rotary motion of the emery-wheel was communicated from the driving-wheel by means of a belt; but this was found disadvantageous for many reasons, and therefore I have substituted the following: The driving-wheel (J is provided with cogs around its entire circumference, and gears with an intermediate pinion, a, placed on a stud or boss projecting from the side of the arm D. This intermediate pinion or cog-wheel gears with another pinion, 1), upon the end of the shaft of the emery-wheel E, and by this means the motion is communicated to the emery-wheel in the same direction that the driving-wheel moves or turns. On the back of the standard B is formed a hook or rest, d, at such place that when the arm D is thrown backward in the position shown in the drawings, the boss or stud of the intermediate cog wheel a will fall in and be supported by said hook or rest.

The object of having the arm supported in this position is that then the emery-wheel may be used for finishing 0d the edges of the knives, grinding their under sides, and for grinding any other articles desired.

On and along the front edge of the platform A, where the knife-bar is to rest, are placed two metallic frames,G Gr, constructed as shown, their inner or adjoining ends being inclined so as to form between them a V-shaped recess, the adjoining edges of two contiguous knives resting upon said inclined ends f f, and the emery wheel working between them. The end f of each frame is made separate from the frame, and constructed so that it can be moved to or from the main part of the frame at any angle desired, and secured to the platform in any required position. By this means the rests G G may be made to conform to the shape of the knife to be ground.

Along the back or rear side of the frames or rests G G is a flange, h, upon which the knife-bar is to rest while the knives are being sharpened. The flange h projects toward the rear in the center, and on this projection is secured a guide, J, which laps over the knives and holds them steady while being ground. This is especially of importance when the grinding is done toward either end of the knife-bar, as then the tendency would be to throw this end upward by the weight of the outer end of the bar if this guide were not there to hold it down. This guide J is made movable, as shown, so that it can be adjusted to any size of knife-bar. In some the rear edges of the knives are flush with the bar, While in others the knives project in rear of the bar, and hence the necessity of having the guide J adjustable is apparent.

Having thus fully described my invention, What I claim as new, and desire to secure by Letters Patent, is-

1. The rest (1 formed upon the standard B, substantially as and for the purposes herein set forth.

2. The combination, with the arm D and emery-wheel E, of the cogged driving-wheel (J, intermediate pinion a, and pinion b, all arranged substantially as shown and described. 3. The frames or rests G G with adjustable end pieces ff, substantially as and for the purposes herein set forth.

4:. The adjustable guideJ arranged to hold the knife-bar, for the purposes herein set forth. In testimony that I claim the foregoing I have hereunto set my hand this 7th day of January, 1873.

Witnesses: J. M. GONNEL.

A. N. MARR, EDM. F. BROWN. 

